Hi Barb
I played the original disk version and later the GOG version and didn't have any problems with either. It was always a stable game for me.
When you first start the game you need to
thoroughly search the beach and shoreline for useful items
and survivors. And then also search and explore the more grassy area back from the beach.
There is a cave close to the beach area too.
After exploring all round, you'll eventually find a path that leads inland and away from the beach.
[I think your first encounter with a foe is when you go East along the shore but I'm sure you see it in plenty of time to avoid it until you've done a fairly good search for stuff.]
I don't understand why you can't draw your weapon. If you have equipped one via the C Screen you just click your middle mouse button (or use the scroll wheel) and it should then appear in your hand
Cheers.
Mad
EDIT :
The guide
HERE is a really good one if you fancy a bit of help.
[ But I see Pokey has already directed you there
]